# US 2018/0321509 A1 · Lenses with improved management of distortion

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- Number: US 2018/0321509 A1
- Document ID: US20180321509A1
- Status: Published application
- Kind: A1
- Application number: 15/774,746
- Filed: 2016-11-09
- Published: 2018-11-08
- Earliest claimed: 2015-11-13
- Assignees: Essilor International
- Applicants: Essilor International
- Inventors: Helene DE ROSSI; Fabien MURADORE
- Web page: https://patentgrep.com/patent/US20180321509A1

## CPC

- G02C 7/068: {Special properties achieved by the combination of the front and back surfaces}
- G02C 7/02: Lenses; Lens systems {; Methods of designing lenses}
- G02C 7/066: {Shape, location or size of the viewing zones}
- G02C 2202/22: Correction of higher order and chromatic aberrations, wave front measurement and calculation
- G02C: SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES (trial frames for testing the eyes A61B3/04; goggles or eyeshields not having the same features as spectacles A61F9/00)

## Abstract

Ophthalmic lenses intended to be worn by non-presbyopic wearers, such as single-vision ophthalmic lenses. The lenses exhibit reduced distortion as perceived by the wearer.

## Claims

### Claim at position 1

1-11. (canceled)

### Claim 12

An ophthalmic lens configured to correct a wearer's eye vision in compliance with a desired value of optical power and/or a desired value of astigmatism, wherein the wearer's eye is non presbyopic, wherein the ophthalmic lens comprises:
an eye-side surface positioned closest to the wearer's eye when the ophthalmic lens is worn by the wearer in given wearing conditions;
an object-side surface positioned opposite to the eye-side surface in the wearing conditions:
a first optical portion having in the wearing conditions a first optical power P1;
a second optical portion having in the wearing conditions a second optical power P2;
wherein:
the first optical portion corresponds in the wearing conditions to a first zone of the object-side surface, wherein the first zone has a mean curvature value MCURV1;
the second optical portion corresponds in the wearing conditions to a second zone of the object-side surface, wherein the second zone has a mean curvature value MCURV2;
wherein P1<P2 and MCURV2<MCURV1, and
wherein
the second optical portion is mainly located in a central, temporal, bottom or top part of the lens when the first optical portion is mainly located in a nasal part of the lens, and
the second optical portion is mainly located in a temporal, bottom or top part of the lens when the first optical portion is mainly located in a central part of the lens.

### Claim 13 (depends on 12)

An ophthalmic lens according to claim 12,
wherein the ophthalmic lens provides at least a first effective portion of stabilized optical power wherein the value of optical power does not deviate by more than +/−0.120 diopters from the value of desired optical power, and wherein the first effective portion corresponds in the wearing conditions to an area of the object-side surface, wherein the first area comprises a disk of at least 6 mm diameter.

### Claim 14 (depends on 12)

An ophthalmic lens according to claim 12, wherein the first zone and the second zone have a different contour.

### Claim 15 (depends on 12)

An ophthalmic lens according to claim 12, wherein the object side surface of the lens is aspherical.

### Claim 16 (depends on 12)

An ophthalmic lens according to claim 12, wherein the object side surface of the lens is not rotationally symmetrical.

### Claim 17 (depends on 12)

An ophthalmic lens according to claim 12, wherein the eye-side surface is not rotationally symmetrical.

### Claim 18 (depends on 12)

An ophthalmic lens according to claim 12, wherein the parts of the lens are defined as follows in (α,β) coordinates, wherein (α,β) are expressed in degrees and wherein SQRT is the square root function:
the central part corresponds to:
the part of the lens within a cone of gaze directions such that
SQRT (α2+β2)≤20° or SQRT (α2+β2)≤10°, or
the part of the lens in the primary gaze direction or the control point of the lens;
the temporal part corresponds to the gaze directions within an ellipse defined by vertices A, B, C, D, with the following coordinates:
A(αA, βA): αA=0 and 20°≤βA≤30°;
B(αB, βB): αB=0 and βA+10°≤βB≤βA−20°;
C(αC, βC); −30°≤αC≤−10° and βC=½ (βA+βB);
D(αD, βD): αD=−αC and βD=βC;
the nasal part corresponds to the gaze directions within an ellipse defined by vertices A′, B′, C′, D′, with the following coordinates:
A′(αA′, βA′); αA′=0 and −30°≤βA′≤−20°;
B′(αB′, βB′); αB′=0 and βA′=20°≤βB′≤βA′−10°;
C′(αC′, βC′); −30°≤αC′≤−10° and βC′=½ (βA′+βB′);
D′(αD′, βD′); αD′=−αC′ and βD′=βC;
the top part corresponds to the gaze directions within an ellipse defined by vertices A″, B″, C″, D″, with the following coordinates:
A″(αA″, βA″); −30°≤αA″≤−20° and βA″=0;
B″(αB″, βB″); αA″−20°≤αB″≤αA″−10° and βB″=0;
C″(αC″, βC″); αC″=½(αA″′αB″) and −30°≤βC″≤−10°;
D″(αD″, βD″); αD″=αC″ and βD″=−βC″;
the bottom part corresponds to the gaze directions within an ellipse defined by vertices A′″, B′″, C′″, D′″, with the following coordinates:
A′″(αA′″, βA′″); 20°≤αA″≤30° and βA′″=0;
B′″(αB′″, βB′″); αA′″+10°≤αB′″≤αA′″+20° and βB′″=0;
C′″(αC′″, βC′″); αC′″=½(αA′″+αB′″) and −30°≤βC′″≤−10°;
D′″(αD′″, βD′″); αD′″=αC′″ and βD′″=−βC′″.

### Claim 19 (depends on 12)

An ophthalmic lens according to claim 12, wherein the optical power varies continuously over the whole lens.

### Claim 20 (depends on 12)

An ophthalmic lens according to claim 12, wherein
the ophthalmic lens is a single vision lens, or
the ophthalmic lens has a single control point, or
the ophthalmic lens is intended for a wearer for which no addition or nil addition is prescribed or required.

### Claim 21 (depends on 12)

A semi-finished ophthalmic lens, wherein the finished surface of the semi-finished lens is identical to the object-side surface (FS) of an ophthalmic lens according to claim 12.

### Claim 22 (depends on 12)

A method for the manufacture of an ophthalmic lens, comprising
machining an ophthalmic lens according to claim 12; and
providing a semi-finished ophthalmic lens.

### Claim 23 (depends on 14)

An ophthalmic lens according to claim 14, wherein the object side surface (FS) of the lens is aspherical.

### Claim 24 (depends on 14)

An ophthalmic lens according to claim 14, wherein the object side surface (FS) of the lens is not rotationally symmetrical.

### Claim 25 (depends on 14)

An ophthalmic lens according to claim 14, wherein the eye-side surface (RS) is not rotationally symmetrical.